Single suction impeller



Ap 1951 RLISEINFELD 2,547,786

SINGLE SUCTION IMPELLER Filed April 29, 1948 INVENTOR.

Lugwlkk. SE/NFELD Patented Apr. 3, 1951 UNITED STATES PATENT orncc SINGLE .SUGTION' EIPELLER,

Ludwik R. Seinfeld, New Providence Township, Union ,County,- N. J.

ApplicationApriL29, 1948, Serial No. 23,971

2 c1aims-. (Cl. 103-415),

solid particles should get lodged between said vanes and the pump casing;

The-conventional manner of buildingimpellers for large slurry pumps has therefore involved reinforcing the impeller vanes by providing two circular ribs, called shrouds, and providing narrow vanes on the outside of one or both shrouds to reduce excessive slip as well as to balance the axial thrust of such impellers. Said shrouds in cooperation with the pump casing wall, spaced from each other by close clearances only, create high turbulance which increases friction and in such a way that said ribs are located alternately near the back and near the front of said impeller. The ribs at the back of the impeller merge with the impeller hub and the ribs at the front of the impeller merge with said short circular member at the impeller eye.

Impellerswith reinforcing ribs arranged as described have all the advantages of open impellers, i. e. accessibility of vanes for grinding, low axial thrust, and low pressure on the stuffing box of the pump, and in addition high resistance to breakage as well as lower impeller friction when compared with shrouded impellers.

The novel features which I consider as characteristic for my invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying'drawings, in which:

Fig; 1 isa sectionnof? the impeller along line; 5-5 ofFig; 2, illustrating the. incorporation of the invention in a. single suction impeller,.the; vanesand ribs being shown in circumferential projection for clarity; and

Fig. 2 isan elevation showing theinlet side of. the impeller in Figs 1.

There is indicated at I 91 the. hub ofan impeller 6 of single suction type which maybe included. in a conventional housing which is indicatedby the construction line dl; and-l0; Discharge takes place into a. conventional volutei passage indicated at l2.

Vanes; it are provided: which; are reinforced by curved members I6 and. H: providing, between adjacent vanes, ribs which serve to deflect the infiowing streams into portions sweeping alternately walls 8 and IU of the casing, the hub l9 being arranged as indicated at 2a to form shrouds for short lengths of the back of the vanes which guide the liquid providing smooth flow alternately in cooperation with casing wall In and ribs I6.

Ribs l6 merge into a circular member 15 being arranged as indicated at 2| to form shrouds for short lengths of the front of the vanes 14 which guide the liquid providing smooth flow alternately in cooperation with casing wall 8 and rib I1. It will be noted that circular member [5 as provided also serves as means to balance the axial thrust of impeller 6.

The impeller thus constructed is particularly adapted for large slurry pump use. Alternating flow conditions along both walls of the pump casing are achieved and thereby the efiiciency of the pump substantially improved with reduction of the turbulance and friction as compared with close clearance pumps provided with shrouded impellers heretofore constructed.

It will also be evident that the vanes are well reinforced by the rib arranged as described and consequently, safe operation with slurries can be achieved without danger of breakage when solid particles get lodged between impeller and pump casing.

Desirably, the construction is such that the reinforcing ribs are provided at a short distance from the end of the vanes, but this is not absolutely essential.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of pumps, differing from the types described above.

While I have illustrated and described the inventions as embodied in pump impellersof the single suction type, I do not intend to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of my invention.

Without further analysis, the foregoing will so fully reveal the gist of my invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention, and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What I claim as new and desire to secure by Letters Patent is:

1. A pump impeller of the single suction type having opposite front and rear faces, said pump impeller comprising in combination a hub; a rear annular member surrounding said hub in the plane of said rear face of said pump impeller; vanes carried by said hub secured to said rear annular member; a front annular member surrounding the impeller eye in the plane of said front face of said pump impeller firmly secured to said vanes; and a plurality of ribs, one between each two consecutive vanes, said ribs being arranged alternately on the front and rear face of said pump impeller secured to said vanes and to the corresponding annular members extending from said annular members to the periphery of the impeller in such a manner as to form impeller channels which are alternately open on opposite faces of said impeller.

2. A pump impeller of the single suction type having opposite front and rear faces, said pump impeller comprising in combination a hub; an annular member surrounding said hub in the plane of said rear face of said pump impeller; an even number of equally shaped vanes carried by said hub secured to said rear annular member; a front annular member surrounding the impeller eye in the plane of said front face of said pump impeller firmly secured to said vanes; and an even number of equally shaped ribs, one between each two consecutive vanes, said ribs being arranged alternately on the front and rear face of said pump impeller secured to said vanes and to the corresponding annular members extending from said annular members to the periphery of the impeller in such a manner as to form impeller channels which are alternately open on opposite faces of said impeller.

LUDWIK R. SEINFELD'.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Samelson Mar. 30, 1926 FOREIGN PATENTS Number Number 

